docs: def copy_playlist_to_config_dir(self):
          """ Copy a foreign playlist in config dir
              Returns:
                  -1: error copying file
                   0: success
                   1: playlist renamed
          """
          ret = 0
          st = path.join(self.stations_dir, self.stations_filename_only)
          if path.exists(st):
              ret = 1
              st = datetime.now().strftime("%Y-%m-%d_%H-%M-%S_")
              st = path.join(self.stations_dir, st + self.stations_filename_only)
              try:
                  copyfile(self.stations_file, st)
              except:
                  if logger.isEnabledFor(logging.ERROR):
                      logger.error('Cannot copy playlist: "{}"'.format(self.stations_file))
                  ret = -1
                  return
              self._get_playlist_elements(st)
              self.foreign_file = False
          if logger.isEnabledFor(logging.DEBUG):
              logger.debug('Playlist copied to: "{}"'.format(self.stations_filename_only_no_extension))
          return ret